Q. Solve the system of equations.x2+y2=325y=−2x−20Write the coordinates in exact form. Simplify all fractions and radicals.(______,______)(______,______)
Substitute y into first equation: Substitute y from the second equation into the first equation.x2+(−2x−20)2=325
Expand and simplify: Expand and simplify the equation.x2+(4x2+80x+400)=3255x2+80x+400=325
Set equation to zero: Subtract 325 from both sides to set the equation to zero.5x2+80x+75=0
Divide and simplify: Divide the entire equation by 5 to simplify.x2+16x+15=0
Factor the equation: Factor the quadratic equation.(x+1)(x+15)=0
Solve for x: Solve for x by setting each factor equal to zero.x+1=0 or x+15=0x=−1 or x=−15
Substitute x into y: Substitute x values into y=−2x−20 to find corresponding y values.For x=−1: y=−2(−1)−20=2−20=−18For x=−15: y=−2(−15)−20=30−20=10
More problems from Solve a system of linear and quadratic equations: circles