Question 1165325
Solve each system of equation by elimination.
Show your work. (uhm sorry but i don't know what you mean
in here but i can help you with the other given)
a. (6,a) 
b. (-4,b) 
c. (C,25) 
d. (d,-5)

a {6x+5y=-20, -6x+10y=25}
Since -6x+10y=25 you can do this
{{{(6x+5y)+(-6x+10y)=(-20)+(25)}}}
{{{15y=5}}}
{{{y=1/3}}}
{{{x=-65/18}}}

b. {5x-4y=23, 7x+8y=5}
Multiply first equation by 2
10x-8y=46 then add to
7x+8y=5
17x=51
X=3
y=-2

Hope that helps!