On the day of the canteen, 800 coupons were sold, the price of each coupon was RM 30 and RM 50 respectively. The amount of money earned from the sale of coupons was RM30000. How many copies of RM30 and RM50 coupons were sold?
So basycilly slope intercept form is y=mx+b where m=slope and b=y intercept slope=-1 subsiute y=-1x+b y=-x+b so we are given the point (-3,2) x=-3 and y=2 is one solution subsitue and solve for b 2=-(-3)+b 2=3+b subtract 3 from both sides -1=b
